There appears to be absolutely no functional reason why the Fanimation Air Shadow ceiling fans retract its four blades when not in use besides "looking cool." But since the chunky metal design was already appealing, the fact that it closes in on itself like a flower takes it over the top. If you add one of the lighting kits that can be mounted below, the fan blades can retract to be fully out of sight.
The basic fan itself is $500, with lighting kits adding up to another $400.
Have I ever mentioned how much I enjoy Oh Gizmo's curatorial acumen? Andrew Liszewski ends up discovering more things I find intriguing that almost any other gadget blogger.